This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X425, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI100 Standard Cylinder SI100X425
The AirTAC Airtac SI100 Standard Cylinder SI100X425 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 425mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X425, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X425
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI100 Standard Cylinder SI100X425
The AirTAC SI100X425 is a discontinued double-acting ISO 15552 profile cylinder delivering 3927 N push force at 0.5 MPa through a 100 mm bore and 425 mm stroke. It features a 25 mm carbon steel rod, M20x1.5 thread, and a G1/2 port. AirTAC replaced this legacy unit with the SAI100X425, a direct upgrade sharing the exact ISO 15552 mounting interface, output force, and dimensions.
The SAI replacement introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet (-S), so it cannot accept CS1-B or DS1-B sensors. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI100 Standard Cylinder SI100X425 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X425 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X425 |
| Bore size | Ø100 mm |
| Stroke | 425 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI100X425 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
The SAI100X425 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI100 Standard Cylinder SI100X425
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×425 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI100 Standard Cylinder SI100X425 Is Used
Heavy Press Staging
Ideal for positioning heavy metal blanks at press stations, utilizing the 3927 N thrust to push parts securely into hard tooling fixtures.
Pallet Reject Arm
Drives long-throw rejection of overloaded pallets on conveyors, where the 425 mm stroke provides the clearance needed to divert loads safely.
Mold Actuation
Shifts large casting molds along the production line, benefiting from the rigid 25 mm rod to cycle heavy tooling over the extended 425 mm travel.
Replacing the Airtac SI100 Standard Cylinder SI100X425 with the SAI100X425
To replace the SI100X425, order the SAI100X425. Confirm your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/2 port, and the 425 mm stroke. Because this SKU has no magnet, it cannot support position sensing; if you need switches, select an SAI100X425S and use current AirTAC sensors. For sizing, neighboring bores offer 2513 N (Ø80) or 6136 N (Ø125) at 0.5 MPa. At 425 mm, prevent rod bending by guiding the load externally. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X425
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI100 Standard Cylinder SI100X425 FAQ
Yes, the SI100X425 is discontinued. The direct replacement is the AirTAC SAI100X425. It shares the identical ISO 15552 mounting interface, 100 mm bore, 425 mm stroke, force, and G1/2 port, fitting directly into existing fixtures.
It features a G1/2 port. Force ratings are: 3927 N push and 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, 7068 N push at 0.9 MPa, and a theoretical maximum of 801 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X425
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X425 replacement — usually within 7-8 hours.